How to convert different contrast parts of image to curve?
Go to this website

Right click on the image and click Save page as (The download file will be in svg format)

Import File

File -> Import -> SVG (If svg is not enable, enable from the addon)

Now u need little cleanup.

Delete the unwanted parts (scale,etc) 

Go to edit mode and select the outer edge and delete vertices

Now you have a clean India Map with the curve



If you need to download separate state download here. Color the different state and place it.

How to Bevel 

Go to the curve tab

Change the shape from 2D to 3D

Add a curve circle.

Select the Map curve and in the bevel object select the circle.